元素“form”上属性“action”的错误值：路径段中的非法字符：“<”是不允许的

Question

From the w3 validator

bad value for attribute "action" on element "form": illegal character in path segment: "<" is not allowed.

This is sending me nuts! I am trying to find the mistake already two hours but all seems fine.

    <form id="contact" method="post" action="<?PHP echo htmlspecialchars($_SERVER['PHP_SELF']);?>" accept-charset="UTF-8">

illegal character in path segment: "<" is not allowed. I tried to find the w3school error but haven't find the solution yet. Help is greatly appreciated.

Answer 1

The PHP code should not go through the validator. You should take the HTML output (after it's been processed by the PHP interpreter) and put that into the validator.

If that's the actual code that gets send to your browser, you should probably check your server setup as PHP does not seem to be processing the page.